What is the product of HIV reverse
transcriptase?
a. single stranded DNA
b. double stranded DNA
c. single stranded RNA
d. double stranded RNA
e. more than one of these
B
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The Xist gene product
A. is never translated into protein. B. is required for the production of Barr bodies. C. coats the X chromosome with RNA. D. associates with proteins to compact the chromosome. E. All of these statements are correct.
Mr. Johnson was becoming slightly deaf. To test his hearing, his doctor held a vibrating tuning fork tightly against Mr. Johnson's jaw. This sent vibrations through the bones of the skull, setting the fluid in the cochlea in motion. Mr. Johnson could hear the tuning fork this way, but not when it was held away from the skull a few inches from his ear. His hearing problem is most likely attributed to the
A. auditory cortex of Mr. Johnson's brain. B. auditory nerve leading to Mr. Johnson's brain. C. hair cells in the cochlea. D. tympanum or the bones of the middle ear. E. fluid of the cochlea.
Martin Pollak studies kidney disease in humans. Why does he use human subjects in his research, instead of animal
models?
a. He can perform invasive experiments on humans. b. He can carry out planned matings in humans. c. Humans have a long generation time. d. He can examine renal phenotypes in conjunction with genetic analyses. e. He can genetically manipulate his patients.
Muscles are in antagonistic sets because
A. muscles cannot lengthen by themselves. B. muscles push but cannot pull. C. they do not like one another. D. there is an increase in metabolic efficiency if they are present in antagonistic sets.